Relley — 34 — Mycotrophy 



endotrophic. Four species of Euphorbia are cited but Asclepias 

 which would seem to be of equal interest as a lactiferous plant has 

 escaped observation except for two reports on A. syriaca. 

 D'Angremond and Hell (1939) describe endotrophic mycorrhizae 

 for Hevea. Three species of Cactaceae are cited, by Johansen (1931) 

 except that Asm also cites N eomammillaria. Monotropa was long a 

 focal point of interest. Twenty-one species of Gentiana are cited, 

 and Oholaria is noted. 



The woody Dicotyls have fared better, and we may run briefly 

 through the list: The Magnolias and Liriodendron, and the tropi- 

 cal Talaiima, Manglietia and Michelia (according to Janse) ; Merati 

 of the Calycanthaceae (Asai) ; Asimina of the Anonaceae ; Sassa- 

 fras, Benzoin and Ocotea of the Lauraceae ; Pittosporiim (Asai) ; 

 Liquidamhar , Altiugia and Haniamelis; Platamis; 9 genera of the 

 Malaceae, four of the Rosaceae, nine species of Prunus; two of the 

 Mimosaceae, 3 of the Caesalpinaceae and 7 of the Leguminosae ; 

 four of the Riitaceae (including 3 spp. of Citrus) ; Picrasma and 

 Ailanthus; Melia and Dysoxylum, two species of Buxus; 3 of the 

 Anacardiaceae, 3 species of Ilex, 2 genera of Celastraceae; 3 of 

 Staphyleaceae; 8 species of Acer; 7 of Aesculus; 7 genera of Sapin- 

 daceae; 4 of Rhamnaceae; 2 of Vitaceae; 5 species of Tilia; Firniiana 

 of the Sterculiaceae ; Thea; Tamarix; 8 species of Daphne, 3 genera 

 of Elacagnaceae ; Nyssa sylvatica (Henry) ; 3 spp. of Eucalyptus; 

 3 genera of Araliaceae, 2 of Cornaceae; Clethra (Asai) ; 21 genera 

 of Ericaceae; including 13 spp. of Vaccinium; Diapensia (Asai) ; 

 Ardisia (Asai) ; Diospyros (Asai) ; Symplocos (one species out of 

 the 290 spp. in this monotypic family !) ; Styrax (Asai) ; 5 genera of 

 Oleaceae; 2 species of Nerium; Gardenia (Asai), 4 genera of 

 Caprifoliaceae. 



For more recent work we may note: Milanez (1940) records 

 root fungi for Citrus aurantifolia, said to be the first record for 

 South America, but he considers them as parasites; Muller (1936) 

 reports on mycorrhizae of citrus in the Netherlands Indies; Reed 

 & Fremont (1935) and Rayner (1933) describe a phycomycete 

 mycorrhiza for Citrus and regard it as beneficial under certain con- 

 ditions. Berkeley (1936) states that raspberry roots (in Canada) 

 show a phycomycetous infestation similar to that in strawberry, as 

 recorded by Richards & McKIay (1936). Bouwens (1937) con- 

 sidered the strawberry endophyte to be a Rhisoctonia, which generic 

 fungus was alsO' responsible for mycorrhizae in quince (Cydonia). 

 A phycomycete mycorrhiza is described likewise for almond {Amyg- 



